$url_object=$entity->toUrl();//todo: file entity type does not have a canonical url and breaks generation, hopefully fixed in https://www.drupal.org/node/2402533
return"<div class='description'>".$this->t("If you would like to say thanks and support the development of this module, a <a target='_blank' href='@url'>donation</a> is always appreciated.",['@url'=>'https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=5AFYRSBLGSC3W'])."</div>";
$form['simple_sitemap_settings']['#prefix']="<div class='description'>".t("If you would like to say thanks and support the development of this module, a <a target='_blank' href='@url'>donation</a> is always appreciated.",['@url'=>'https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=5AFYRSBLGSC3W'])."</div>";